Trading/Gifting/Selling/Auctioning....you name it, it's been suggested many many times.

The fact is, if I can breed as many Britanys as I want, no star, and give them away, Kobojo would never sell another one for gold or credits. The only suggestion I've ever seen that could work goes like this:

I breed a Britany and immediately freeze her. Level 1, 0 exp.

I tag her as 'for sale' and she leaves the freezer.

She then pops up in 'The Black Market' for sale for gold. Kobojo sets the price, they get paid the gold, and the seller gets paid in credits at an equivalent of 50 credits per gold (just making up a number for example).

This would make 99% of breedable mutants for sale at any given time (my guess) giving more opportunity for people to spend their gold.

No players would gain gold by becoming a breeding factory so Kobojo wouldn't lose money there either.

I wasn't an economy major, so there may be something else that would jeopardize Kobojo's profit margin in this idea.

So basically, if there's a CHANCE that they'd lose income, it'd never come to fruition.